Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

112Maggenti and Gardnerbasal diaphragm (BRYO: Stenolaemata) The diaphragm actingas the floor of the living chamber.basal disc (BRYO: Stenolaemata) The encrusting proximalmostpart of an ancestrula.basalia a. [L. basis, base] (PORIF) Pertaining to spicules protrudingfrom the lower surface of a sponge.basalis n. [L. basis, base] (ARTHRO: Insecta) The main mandibularsclerite to which all other parts are joined.basal knobs (NEMATA) The posterior knobs of the oral stylet.see stylet knobs.basal lamina (PORIF) The attachment surface.basal margin (ARTHRO: Crustacea) In Cirripedia, the loweredge of the scutum, tergum or other plates.basal plates 1. (ECHINOD: Crinoidea) A cycle of 5 aboral calyxplates in primitive stalked crinoids. see radial plates. 2.(NEMATA) The circular base of the cephalic framework,composed of an annular structure with posteriorly directedrim, the basal ring, and six radial elements.basal platform (BRYO: Gymnolaemata) In Cheilostomata, themultizooidal skeletal layers of the basal zooidal walls; basalplate.basal ring (NEMATA) The annular structure that extends posteriorlyfrom the outer margin of the basal plate of the cephalicframework.basal sclerites (ARTHRO: Insecta) In Diptera, two lateral, verticallamellae uniting ventrally to form a trough that lodgesthe pharynx.basal suture (ARTHRO: Insecta) In Isoptera, the line alongwhich the wing separates from the body and sheddingtakes place.basal window (BRYO: Gymnolaemata) In Cheilostomata, thesubcentral, uncalcified section of an encrusting colony'sexterior basal zooidal wall.basal zooidal wall (BRYO) In Stenolaemata and Gymnolaemata,the interior or exterior zooidal supporting wall, normallyparallel to the orificial wall.